Improvement in check-valve cocks



to the opening O for the valve D.

`so as to finish and complete the valve in all its parts,

m, o not Letters Patent No. 99,652, dated February 8, 1870.

IMPROVEMENT IN' CHECK-'VALVE COCKS.

The Schedule referred to in these Letters Patent and making part of the same To all whom it may concern Be it known that I, J osnru H. DAVIS, of the city and county of Allegheny, and State of Pennsylvania, have invented a certain new and'useful article of manufacture, viz, Malleable Gast-Iron and Steel Check- Talve Cock, and lI do hereby declare that the following is a full, clear, and exact description thereof', reference being had to the accompanying drawings, and to the letters of reference marked thereon.

The nature of my invention consists in making a new article of manufacture, viz, check-valve cocks, constructed of cast-iron, and subsequently annealed.

To enable othersskilled in the art to make-aud use my invention, I will proceed to'describe its construction.

Iii the accompanying drawings, which form part of my speciiication- Figure l is a vertical and longitudinal section of my improvement in check-valve cock.

Figure 2 is a side elevation of the same.-

The body of the check-valve cock, consisting of the chambers A, B,and B', is made in one piece,'andA is cast in the usual way. 'lhe bore vof the chambers A, B, and B', are all of the same diameter.

The inlet g vand outlet h are of such diameter that they will receive pipes the bore of which may be equal The guide-cap, or mounting f of the valve A, may be made of malleable iron, steel, or brass, and the valve and its sten may also be made of the same metals.

The guide :t is. cast with the body of the checkvalve cock, and this guide x, in combination with the guide in the cap f, forms a double guide for the stern ofthe valve D, which 1is of great advantage in prop-, erly seating it after each movement.

The castings for the several parts of the valve should be made of that quality of pig-iron which is suitable for being converted into malleable cast-iron byany of the known methods, which malleable castings may afterward be subjected to the process of p comentation, and thereby be converted into steel.

The castings, after being properly converted into malleable cast-iron, are then carefully cleaned, by placing them in a rattling-mili or scouringmill, suclr as are used by manufacturers of malleable castings. After being properly cleaned,they are fitted up as shown in the accompanying drawings.

Now, if it is desirable to convert the entire valve, or any of its' parts, into steel, the diiereut ptrts are separated-and placed in suitable converting-chests or chambers, and subjected to the process of cementation', which process is well understood by the skilled metallurgist.

' The advantage of constructing check-valve cocks 7. of malleable cast-iron l consists- First, in making a strongerand more durable checkvalve cock than can' be made of ordinary cast-iron or 'bl-ass, for the tensile strength of malleable cast-iron is greater than either castiron or brass.-

' Second, a check-valve cock, constructed-of malleable cast-iron or steel, may be made much lighter than when'made of ordinary cast-iron or brass, thereT by saving stock and cost of transportation.

Third,.a check-valve cock, constructed of malleable cast-iron or steel, as lrereinheibre described, can be made cheaper than when made of brass, and is equally susceptible of a fine nish, and at less cost for finishing.

Fourth, check-valve cocks,7 of every kind, form, and size, may, with advantage, be constructedof malleable cast-iron or steel, as herein described, which is very diiiicult to accomplish with ordinary cast-iron.

Fifth, any one or more of the several parts of the check-valve cock may, with ease, facility, and cheapness, be made of steel, by constructing it or them in the manner hereinbefore described.

The skilful mechanic and manufacturer of checkvalve cocks will readily see and understand, from the foregoing description of my invention, that my improvementavill be of great advantage to the consumer and user of valve-cocks. v

It will `be perceived that theexcellence of this ch eckvalve cock depends upon the use of iron that has passed through the process of annealing, and'that for this purpose malleable iron and steel are hence equivalents. I therefore do'uot confine myself to material in either ofthese stages of manufacture; but

What VI claim, as a new article of manufacture, is A check-valve cock, made of castdron, and subsequently annealed, all substantially as herein described.

' JOS. H. DAVIS.

Vitnesses:

A. O. JOHNSTON, JAS. p G. THOMPSON. 

